On 5/31/22 3:35 PM, Usama Arif wrote: > > > On 31/05/2022 20:22, Jens Axboe wrote: >> On 5/31/22 1:18 PM, Usama Arif wrote: >>> >>> >>> On 31/05/2022 19:58, Jens Axboe wrote: >>>> On 5/31/22 12:41 PM, Usama Arif wrote: >>>>> This provides consistency between io_uring and the respective I/O syscall >>>>> and avoids having the user of liburing specify the cwd in sqe when working >>>>> with current working directory, for e.g. the user can directly call with >>>>> IORING_OP_RENAME instead of IORING_OP_RENAMEAT and providing AT_FDCWD in >>>>> sqe->fd and sqe->len, similar to syscall interface. >>>>> >>>>> This is done for rename, unlink, mkdir, symlink and link in this >>>>> patch-series. >>>>> >>>>> The tests for these opcodes in liburing are present at >>>>> https://github.com/uarif1/liburing/tree/cwd_opcodes. If the patches are >>>>> acceptable, I am happy to create a PR in above for the tests. >>>> >>>> Can't we just provide prep helpers for them in liburing? >>>> >>> >>> We could add a io_uring_prep_unlink with IORING_OP_UNLINKAT and >>> AT_FDCWD in liburing. But i guess adding in kernel adds a more >>> consistent interface? and allows to make calls bypassing liburing >>> (although i guess people probably don't bypass liburing that much :)) >> >> I'm not really aware of much that doesn't use the library, and even >> those would most likely use the liburing man pages as that's all we >> have. The kernel API is raw. If you use that, I would expect you to know >> that you can just use AT_FDCWD! >> >>> Making the changes in both kernel and liburing provides more of a >>> standard interface in my opinion so maybe it looks better. But happy >>> to just create a PR in liburing only with prep helpers as you >>> suggested if you think that is better? >> >> I don't disagree with that, but it seems silly to waste 5 opcodes on >> something that is a strict subset of something that is already there. >> Hence my suggestion would be to just add io_uring_prep_link() etc >> helpers to make it simpler to use, without having to add 5 extra >> opcodes. >> > > Thanks, I have created a PR for it on > https://github.com/axboe/liburing/pull/588. We can review it there if > it makes sense! Sounds good, we'll move it there. -- Jens Axboe
